of denver



G. M. NELL.

MEANS FOR OPENING THE BORES OF ROCK DRILLING STEELS. APPLICATION F'IL'EDJUNE 14, 1919.

1,388,437, Patented Aug. 23, 1921.

2 SHEETS-SHEET I.

I/VI/EIIITOR 1%; ATTORNEY G. M. NELL.

MEANS FOR OPENING THE BORES OF ROCK DRiLLlNG STEELS.

APPLICATION FILED JUNE 14, 1919.

1,388,437, Patented Aug. 23, 1921.

2 SHEETSSHEET 2.

Gwiaw/V/Vel UNI TE D STATES PATENT OFFICE.

'GUSTAVE NELL, OF DENVER, COLORADO, .ASSIGNOR TO THE DENVER ROC DRILLMANUFACTURING COMPANY, OF DENVER,

, WARE.

COLORADO, A CORPORATION OF DELA- mnnns r03 OPENING THE BORES orROCK-DRILLING STEELS.

drill steels of that type having longitudinal bores therethrough, thesebores are apt to become partly closed or misshapen, and it is desirablethat the'same-in the completed steel be fully open.

The primary object of the present invention is to provide means of anovel'and prac:

tical character for effectively mounting bore opening apparatus on adrill sharpener, so

that the usual steel clamping mechanism may be utilized for holding thedrill steels while the bores are being opened, the bore openingapparatus being in the form of an attachment that can be placed upon thesharpening apparatus Without materially altering or modifying itsstructure. 7

A further object is to so arrange the mounting that it may alsoconstitute a support for a pin extractor, therebyproviding a commonsupport or attachmentfor both mechanisms. I,

An embodiment of the invention that is at present considered the'preferablelone, is

illustrated in the accompanying drawings,

wherein Figure 1 illustrates in outline a drill sharpener withthe'opening apparatus and itsv mounting in place thereon,

Fig. 2 is a detail mounting, H

Fig, 3 is a detail horizontal sectional View of a portion of themountingand the adj acent portion of the drill sharpener base to whichis attached, V

I Fig. 4 is aplan view of the mounting with the pin extractor in place,

- Fig. 5 is a detail perspective view of the extractorsupporting yoke,

.Flg. 6 1s a longitudinal sectional View through the bore openingapparatus, and

Fig. 7 is a detail sectional view through the pin extractor.

Specification of Letters Patent.

, bolts 10 that holds perspective view of the tending reduced PatentedAug. 23, 1921.

Application filed June 14, 1919. Serial No. 304,296.

.tion 9 being a cylinder and containing a piston, not shown, piston rod15 with member 11. This and it is believed tion.

In the present embodiment, a bracket arm 16 is provided, the outer endof which has a substantially horizontal fiat surface 17, the

that is connected by a the upper movable jaw structure is well knownneeds no further exposiintermediate portion 18 having angularly disposedribs, and the inner end having a curved portion 19 that corresponds tothe upper peripheral surface of the drill sharpener base to which it issecured by suitable bolts. as 20 passing therethrough and threaded intothe supports the outer end of the arm 16, having a horizontal portion 22located beneath the portion 17, and having at its lower and inner end anear 23 provided with an opening 24 through which is passed one of thethe sections 8 and 9 of the base together.

Secured to the outer end of the bracket,

thus formed, is bore opening mechanism de scribed generally by thereference numeral 25. This bore opening mechanism includes a cylindermember 26 having a base 27 that is secured upon the horizontal endportions 17 and 22 of the bracket by bolts 28 that not only serve tohold the base to the bracket, but also fasten the parts 17 and 22 t0-gether bypassing through both.

The cylinder member is provided with heads 29, and operating therein, isa tubular piston having a head30 and oppositely exportions 31 thatslidably pass through the heads 29. The said tubular piston provides a.'piston chamber 32 closed by a front head 33 and by a rear head 34, thelatter held in place by a tubular said base. A brace 21 l same time thehammer piston being in opplug 35. The front head 33 contains a tappet36, the rear end of which projects into the chamber 32, the front endprojects ing beyond the head 33, and having a socket 37 to receive therear end of a tapered punch pin 38. This pin may be held in place by atransverse key 39, and the arrangement is such that the pin will bealined withthe bore of a drill steel clamped by the jaws 13' and M. Areciprocatoryhammer piston ll operates in the chamber 32 and strikesagainst the rear end of the tappet 36, said piston having a rearwardextension or neck that is slidable in the head 3% and projects into thechamber 43 of the plug 35. T he actuating fluid tothe apparatus is con:trolled by a suitable valve having a handle,

shown at 44:. 7

It is however, believed to be unnecesary to go into detail regarding thedistribution o'f-the motive fluid, beyond the statement that when thethrottle valve is turned in thus be clear that when a drill steel hasbeen properly shaped, sharpened or otherwise operated upon, and whileits end is still heated to permit working of the metal, if it is clampedbetween the jaws l3 and 14, the punch pin may be advanced so that thefree end thereof will enter the bore, and at the oration, will drive thesame into the bore and properly open it. When so opened the punch pincan be withdrawn.

The supporting and securing means may also ,afl'ord convenient means forholding in place a' pin extracting apparatus. To this end, a yoke 45 isemployed having its ends secured to the bracket and to the base of thedrill sharpener by the bolts 20, as clearly illustrated in Fig. a. Thisyoke, in turn, has bolted to it, a base 46 having at one end a socket4-7 for receiving the end of a drill steel, the said socket beingprovided with an aperture 48 in its rear end, which aperture is oflessdiameter than the diameter of the drill steel. A guide bar 49extends rearwardly from the socket, and has slidably mounted thereon acarriage 50 provided with a clamping cam 51. This carriage has a linkconnection 52 with a lever 53 fulcrumed, as shown at 54 onthe rear endof the guide bar.

In using the extractor, the end of the drill steel with the pinprojecting therefrom is placed in the socket 47 with the projectingportion of said pin extending through the aperture .48. This projectingend is clutchedby operatingthe cam 51 and the carriage is then movedrearwardly by means of the lever 53, whereupon the pin will bewithdrawn.

It will be obvious that the mounting above described is simple and hasbeen found entirely practicable and successful for at- 5 taching drillsteel bore opening means to a drill sharpener in position to cooperatewith the jaws of the sharpener. It will benoted moreover that themounting can beeasily placed inpositionand does not require-maso terialmodification of the drill sharpener structure. It also provideseffective means for securing in place a pin extractor when so desired.

From the foregoing, it is thoughtthatthe construction, operation andmany advantages of the herein described invention will be apparent tothose skilled in the art. without further description, and it will beunderstood that various changes int-he size, shape, proportion andminordetails of construction may be resorted to without departing from thespirit or sacrificing any of the advantages of the invention.

.Havingthus fully described my invention, what I claim as new, anddesire to secure by Letters Patent, is

1. In apparatus of the character set forth, the combination with adrillsharpening machine having relativelymovable drill steel 00 clampingjaws, of a bracket arm. secured at one point to themachine, a bracevforthe arm connected to another portion of the machine, and boreopening mechanism mounted on the bracket in positionto enter 5 the boreof adrill steel held by-the jaws.

2. In apparatus of the character set forth, the combination with a drillsharpening machine including a sectional base,means holding the basesections together and relatively movable drill steel clamping jawsmounted on the base, ofa bracket arm securedto the base, a brace for thearm having its end secured to the base bythe means which secures thebase sectionstogether, and bore opening mechanismmounted-on the bracketarm in position to enterthe bore of a drill steel held by the jaws. V

3. In apparatus of the character set forth, thecombination with a drillsharpening machine having relatively movabledrill steel clamping jaws,of a bracket armsecured at one point to the machine, a brace for the armconnected to another portion of the machine, bore opening mechanismmounted on the bracket in positiontoenter the bore of a drill steelheld. bythe jaws, and common means for securing the bore openingmechanism to the arm and alsosecuring'the arm and brace together.

4. In apparatus of the character set forth, the combination with a drillsharpening machine including a sectional base, bolts holding the basesections together and relatively movable drill steel clamping aWsmounted on the base, of a bracket arm secured to the and engaging thebore opening mechanism to secure the same in place.

5. An attachment of the character set forth, comprising a bracket armhaving means for securing it to a drill sharpener, bore opening meansmounted on the arm and adapted when said arm is in place on a drillsharpener, to enter the bore of a drill steel held by the jaws of saiddrill sharpener, and

a brace for the arm secured thereto and having means for attachment tothe drill sharpener.

6. An attachment of the character set forth, comprising a bracket, drillsteel bore opening apparatus mounted thereon, and means for securing thebracket at spaced points to the base of a drill sharpening machine, toposition the opening apparatus, to enter the bore of a drill steelsecured by the jaws of said sharpener.

7 An attachment of the character set forth, comprising a pin extractingmechanism, a mounting for the same having devices for fastening it tothe base of a drill sharpener, and bore opening mechanism including asupport engaged by and adapted to be fastened to the base of said drillsharpener by the mounting of the pin extracting c mechanism.

In testimony whereof, I afiix my signature in the presence of twowitnesses.

'7 GUSTAVE M. NELL. Witnesses:

LUTHER V. JOHNSON, EDWD. L. OLDHAM.

